import java.awt.*;


import java.awt.event.*; import java.util.List; public class Missile {
    public static final int XSPEED = 10;
    public static final int YSPEED = 10;

    public static final int WIDTH = 10;
    public static final int HEIGHT = 10;

    Tank.Direction dir; private int x, y;

    private boolean good;
    //判断子弹是否活着
    private boolean live = true;

    public boolean isLive() {
        return live;
    }

    private TankClient tc;

    public Missile(int x, int y, Tank.Direction dir) {
        this.x = x; this.y = y; this.dir = dir;
    }

    public Missile(int x, int y, boolean good, Tank.Direction dir, TankClient tc) {
        this(x, y, dir); this.good = good; this.tc = tc;
    }

    public void draw(Graphics g) {
//如果没有活着，就从容器中去掉，并且不再画了
        if(!live) { tc.missiles.remove(this); return;
        }
        Color c = g.getColor();
        if(this.good) {


            g.setColor(Color.RED);
        } else {
            g.setColor(Color.BLACK);
        }
        g.fillOval(x, y, WIDTH, HEIGHT); g.setColor(c);

        move();
    }

    private void move() { switch(dir) { case L:
        x -= XSPEED;
        break; case LU:
        x-= XSPEED; y -= YSPEED;
        break; case U:
        y -= YSPEED;
        break; case RU:
        x += XSPEED; y -= YSPEED;
        break; case R:
        x += XSPEED;
        break; case RD:
        x += XSPEED; y += YSPEED;
        break; case D:
        y += YSPEED;
        break; case LD:
        x -= XSPEED; y += YSPEED;
        break;
    }

        if(x < 0 || y < 0 || x > TankClient.GAME_WIDTH || y > TankClient.GAME_HEIGHT) {


            live = false; tc.missiles.remove(this);
        }
    }

    //getRect()可以正好拿到包在坦克外面的方块
    public Rectangle getRect() {
        return new Rectangle(x, y, WIDTH, HEIGHT);
    }

    //intersects可以判断这两个方块是否相交
//如果已经碰撞，那么就将子弹和坦克都设置为false
    public boolean collidesWithTank(Tank t) {
//如果子弹活着，子弹与坦克相碰，坦克活着，
//子弹与坦克不是一伙的，那么这样才开火
        if(this.live && this.getRect().intersects(t.getRect()) && t.isLive() && this.good != t.isGood()) {
            if(t.isGood()) {
                t.setLife(t.getLife() - 20);
                if(t.getLife() <= 0) { t.setLive(false);
                }
            } else {
                t.setLive(false);
            }
            this.live = false;
            Explode e = new Explode(x, y, tc); tc.explodes.add(e);
            return true;
        }
        return false;
    }

    public boolean collidesWithTanks(List<Tank> tanks) {
        for(int i = 0; i < tanks.size(); i++) {
            if(collidesWithTank(tanks.get(i))) {
                return true;
            }
        }
        return false;
    }

    public boolean collidesWithWall(Wall w) {


        if(this.live &&
                this.getRect().intersects(w.getRect())) {
            this.live = false; return true;
        }
        return false;
    }

}
